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gous purposes; and

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d l lliltlill (gltten temi; @lim v `GEORGE w. CILLEY, jor NORWICH, CONNECTICUT, AssiGNon v'ifo HIMSELF .AND WILLIAM'VP. ADAMS, OF SAME Lettersrqmmagsaste, @aan May 11,1869. V

m consumo LATcH Arm Loon y ThalBchdduIo referred toiuthese Letten Patent and part ofthe name.

To all 'whom it mag/concern y Be it known that I, GnomnW. OILLEY, of Norwich, in the `county of New London, and State of Oonnecticut, have invented anew an'd useful Improvement in Door-Locks3V and I do hereby declare that the fol-' lowing is a full, clear, and exact description of the same,

l reference being had to the annexed drawings, making part of this speciiication, in which- Figure l is an elevation', showing the interior mechansmof the lock.` A

Figure 2 is avertical section `on theline :rf-zy.

The sameletters inV both theflgures .indicate identical parts.

My invention relates to locks which are especially adapted to -use on the doors of stores, and for analo- It consists in the combinations oi' mechanism to be hereinafter set forth, for greater security against picking. i' f" 1n the annexed drawingsv A isthe latch, which is projected by theV spring B, andconstructed with a slot, a, 'enclosing a projection `fromthe caseofthe lock, to direct thebolt in a right line. f i

O is the latch-dog', acting on the bifurcations of the ordinarymanner, and turned by thespin- E isthe .,bolt, which is l slotted, and directed in a right lli`ne',\in the same manner as the latch, by another projection on the case.

A series of tumblers `is shown at F. I have'shown live; a greater or less number may be used.

.A dog, Gr, the forml of whichis shown in fig.4 1, is

i pivoted, at g, to the bolt-E, and placed in relation to the other portions of thelockas shown. l

The dog is'pressed" downward by a spring, as at g'. It is raised bythe l. key, and when raised, it receives the pin C', attached to the lower armV of the latchdog into theA notch G', so that by turning the knob, the latch and'bolt will be moved at the AsameV time.

'The key does not, as in other locks in ordinary use,-

i act on the bolt at all, but only on the dog G, and on the tumblers. a y l l 'The stem Eof the bolt, when it is thrown, rests against the edges of the tumblers F, Yso that the bolt can only be retracted when al1 the notches F are in line'with the stem E', which ts into them neatly.

` 'lhe notchesare irregularly placed, and must all be in line before the bolt can be retracted. This can only be effected by the key, `because a person picking the lock, has no guide to determine the proper position of the tumblers, which lare all unobstructed, so that Vther notches may be thrown beyond the zend of the stem.

If any of the series' is thrown. either too far or not'far n enough, the bolt cannot be thrown.

`No guide is afforded a person picking thelock, and

it is practicallyV impossible, unless pressure is brought to bear 'un .the end of the bolt. j K To make this pressuredefeat its own purpose, the

upper endsmof the tumblers are made narrowerthe bottom, to form a shoulder, as shown.

The tumblers are placed between four guides, I, K, L, and M. v v s The springs H are so bent as to act not only to draw than ' backthe tumblers, but also to draw them forward against the g'uides'L and M, on the front edge.

The guide K forms a fulcrnm, on which theftumblers may oscillate far enough for the backs of the notched le'nds to bear against the guide I, which servesv as a stop to Acatch againstthe shoulder on the tumblef,l`

and arrest its throw before thev notch reaches the end `of the stemE.

The bolt is anowed a little 10st montati that it may be pressed back easily against the tumblers, and thus lock them by the very pressure which is essential to give any indication to a person picking the lock where to place theseveral tumble-rs. When the bolt is retracted, the latch operates lik any ordinaryone. Y v

To lock it, turn the spindle and draw back the latch. The notch Gf will now be in line withV the pin C',

. Inserting the key, and turning it quarter round, 4'the vdog G will be raised, and the vconnection between the latch and bolt formed. Then, on withdrawing the key,

and.. turning the knob `in theopposite direction, the f bolt will be projected,'disengagng the tumblers, which will be drawn back by the springs.

ATo unlock the bolt, insert the key and turn it; this will Vraise the tumblers to the proper position, and also the dog G to connect the latch and bolt. Then, on turning the knob, the bolt will be retracted, the stem E entering thenotches F. l What I claim as my invention, anddesire to secure by Letters Patent, is- Y ,1. In combination with the two former when the key is made to act on the boltdog, substantially as and for the purpose setforth.

\ 2. The case, when constructed with projections I, K, L, and M, `in combination with tumblers `having a Vshoulder formed on the back, and so arranged in relation tothe projections, that when Ithe bolthas'been projected, and is then' pressed against the tumblers, said shoulders shall engage the projection I, and pre- -vent the raising ofthe tumbler, substantially ,as set latch and bolt, the dogs O and G, so constructed that they may connect thev 

